TheAudio-Technica ATH-M50x Sound-Isolating Monitor Headphones(Black) are designed for use in critical studio mixing and tracking as well as for DJ monitoring applications. They feature 45mm Neodymium drivers with copper-clad aluminum voice coils that provide an extended frequency response from 15Hz to 28kHz. The headphones have a circumaural, around-the-ear design that provides sound isolation in loud environments. The ATH-M50x's ear cups can be swiveled 90-degrees, allowing for single-ear monitoring. The headphones have a detachable single-sided cable system, and a 3-meter coiled cable, a 3-meter straight cable, and a 1.2-meter straight cable are included. When not in use, the ATH-M50x can be folded down and put away in the included carry pouch.
TheFiio A3 - Portable Headphone Amplifieris designed for mobile Hi-Fi listening applications and is compatible with a wide range of headphones, earphones, and other in-ear monitoring systems. The all-aluminum alloy body and chassis of the amplifier shields against electromagnetic interference and the built-in rechargeable 1400 mAh battery provides approximately 16 hours of operation on a four-hour charge via mini USB port. For I/O, it features an 1/8" stereo auxiliary input and an 1/8" stereo headphone output.